CN108484920B - High-bonding-strength environment-friendly vacuum pressure impregnating resin - Google Patents
High-bonding-strength environment-friendly vacuum pressure impregnating resin Download PDFInfo
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- CN108484920B CN108484920B CN201810189554.9A CN201810189554A CN108484920B CN 108484920 B CN108484920 B CN 108484920B CN 201810189554 A CN201810189554 A CN 201810189554A CN 108484920 B CN108484920 B CN 108484920B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/68—Polyesters containing atoms other than carbon, hydrogen and oxygen
- C08G63/685—Polyesters containing atoms other than carbon, hydrogen and oxygen containing nitrogen
- C08G63/6854—Polyesters containing atoms other than carbon, hydrogen and oxygen containing nitrogen derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/6858—Polycarboxylic acids and polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L87/00—Compositions of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
- C08L87/005—Block or graft polymers not provided for in groups C08L1/00 - C08L85/04
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Abstract
The invention discloses an environment-friendly vacuum pressure impregnation resin with high bonding strength, which comprises modified unsaturated polyester as raw materials, wherein the modified unsaturated polyester is unsaturated polyester modified by imine and epoxy resin, and specifically comprises the following components: imine dicarboxylic acid, at least one polybasic acid and at least one polyhydric alcohol are used as raw materials, and imine modified unsaturated polyester is prepared through polycondensation reaction; then mixing with epoxy resin, and carrying out copolymerization reaction to obtain unsaturated polyester modified by imine and epoxy resin together. The invention provides a vacuum pressure impregnating resin, which takes modified unsaturated polyester as a raw material, has the advantages of high bonding strength, low dielectric loss, low volatile matter and stable composition, and is suitable for VPI impregnating insulation treatment of various motor electrical appliances.
Description
Technical Field
The invention relates to the technical field of impregnating insulating paint, in particular to environment-friendly vacuum pressure impregnating resin with high bonding strength.
Background
The vacuum pressure impregnation (VPI for short) technology is the best insulation treatment technology in the world at present, and comprises the elements of impregnating resin, a dry mica tape, a VPI process, VPI equipment, a tape wrapping machine, an anti-corona technology and the like. The final curing properties of the insulation are considered in the standards IEC371 and J/T6488.4 to be mainly dependent on the vacuum pressure impregnation resin used, so impregnation of the resin is most important in VPI systems.
At present, the widely applied impregnating resins include unsaturated polyester, epoxy resin, polyimide resin, organic silicon resin and the like. The unsaturated polyester resin has low price and economy, and good manufacturability and mechanical property, so the unsaturated polyester resin can be widely applied to the fields of machinery, chemical engineering and the like. With the improvement of the environmental protection concept, the VPI impregnating resin gradually develops towards the direction of low volatilization and no solvent, so as to replace the traditional unsaturated resin system taking styrene as a solvent.
Currently, many companies are beginning to try to replace styrene with high boiling, high activity, low toxicity and odorless reactive diluents, including mainly diallyl phthalate (DAP), triallyl isocyanurate (TAIC), and acrylates and methacrylates.
For example, chinese patent publication No. CN 102225986 a discloses an environment-friendly solvent-free impregnating resin and a preparation method thereof, wherein the impregnating resin comprises the following components in parts by weight: 100 parts by weight of high heat-resistant unsaturated polyester resin; 0-100 parts by weight of modified epoxy resin; 50-200 parts of a novel reactive diluent; 0.1-1 part by weight of a polymerization inhibitor; 1.5-3.8 parts by weight of an initiator; 0-2 parts of an auxiliary agent. The high heat-resistant unsaturated polyester resin is one or the arbitrary combination of more than two of organosilicon modified unsaturated polyester resin, N-benzene maleimide modified unsaturated polyester resin, 4' -diphenylmethane bismaleimide modified unsaturated polyester resin, mosaic modified m-benzene unsaturated polyester resin, dicyclopentadiene synthesized unsaturated polyester resin and unsaturated polyimide resin.
According to the invention, the viscosity of the epoxy resin is reduced to a certain extent by using the acrylic acid modified epoxy resin, but the wide application of the acrylic acid which is volatile and corrosive is limited to a certain extent. In addition, the heat-resistant unsaturated polyester resin as the main component of the impregnating resin of the patent also has the problem of high viscosity, so that the prepared impregnating resin still needs to add a large amount of reactive diluent to reduce the viscosity of the impregnating resin.
The use of large amounts of reactive diluents increases the volatile organic content of the resin and also reduces the properties of the impregnating resin, which greatly limits its application in the VPI impregnating resin field. Therefore, modification of unsaturated polyester resins and improvement of formulations become key to solving these problems.
Disclosure of Invention
The invention provides a vacuum pressure impregnating resin aiming at the problems in the prior art, which has high bonding strength, low dielectric loss and obviously reduced volatile content.
The specific technical scheme is as follows:
the environment-friendly vacuum pressure impregnating resin with high bonding strength comprises modified unsaturated polyester which is modified by imine and epoxy resin, and the specific preparation method comprises the following steps:
the method comprises the following steps: imine dicarboxylic acid, at least one polybasic acid and at least one polyhydric alcohol are used as raw materials, and imine modified unsaturated polyester is prepared through polycondensation reaction;
the mass of the imidization dibasic acid is 1-3% of the total mass of the polybasic acid and the polyhydric alcohol;
step two: mixing the imine modified unsaturated polyester prepared in the step one with epoxy resin, and carrying out copolymerization reaction to prepare unsaturated polyester modified by both imine and epoxy resin;
the mass ratio of the epoxy resin to the imine modified unsaturated polyester is 1: 0.5 to 1.
Preferably, the imine modification process in the step one specifically comprises the following steps:
adding imidized dibasic acid, at least one polybasic acid and at least one polyhydric alcohol serving as raw materials into a reaction kettle according to a certain proportion and sequence, performing polycondensation reaction at 180-200 ℃ to obtain water, cooling to a certain acid value, adding a polymerization inhibitor, and cooling to room temperature to obtain imine modified unsaturated polyester;
preferably, the imidic diacid is prepared by using trimellitic anhydride and diamine as raw materials and sequentially carrying out a ring-opening reaction and an imidization reaction, wherein the reaction equation is shown as the following formula:
the diamine in the formula is at least one selected from 4,4 '-diaminodiphenylmethane, 4' -diaminodiphenyl ether and 1, 6-hexanediamine. Further preferably, the diamine is selected from 4,4' -diaminodiphenylmethane. Tests show that the vacuum pressure impregnation resin finally prepared from the 4,4' -diaminodiphenylmethane initial raw material has the best comprehensive performance of the bonding strength, the dielectric loss factor and the volatile content.
Preferably, the method comprises the following steps:
the polybasic acid is selected from at least one of isophthalic acid, methyl nadic anhydride, maleic anhydride and methyl tetrahydrophthalic anhydride;
the polyol is selected from at least one of 1, 2-propylene glycol, neopentyl glycol, 3, 3-diol and 1, 4-cyclohexanedimethanol;
the molar ratio of the polybasic acid to the polyhydric alcohol is 1: 1 to 1.3.
The polymerization inhibitor is hydroquinone or p-tert-butyl catechol, and the mass of the polymerization inhibitor is 0.01-0.05% of the total mass of the polybasic acid and the polyhydric alcohol.
More preferably, the acid value of the imine modified unsaturated polyester is 30 to 40 mgKOH/g.
Preferably, the epoxy resin modification process in the second step specifically comprises the following steps:
and (2) mixing the imine modified unsaturated polyester prepared in the step one with epoxy resin, performing copolymerization reaction at 100-140 ℃, cooling to room temperature after a certain acid value is reduced, and preparing the unsaturated polyester modified by the imine and the epoxy resin together.
Preferably, the epoxy resin is at least one selected from the group consisting of bisphenol a type epoxy resins, alicyclic epoxy resins, and hydrogenated bisphenol a type epoxy resins;
the mass ratio of the epoxy resin to the imine modified unsaturated polyester is 0.1-1: 1; further preferably, the mass ratio of the epoxy resin to the imine modified unsaturated polyester is 0.3-0.5: 1.
more preferably, the acid value of the unsaturated polyester modified by the imine and the epoxy resin is 10-20 mgKOH/g. Tests show that the vacuum pressure impregnating resin prepared by using the modified unsaturated polyester with the acid value range as a base material has higher bonding strength, lower volatile content and lower dielectric loss.
Preferably, the preferable modified unsaturated polyester is used as a base material, and the high-bonding-strength environment-friendly vacuum pressure impregnation resin comprises the following raw materials in percentage by mass:
preferably, the method comprises the following steps:
the epoxy resin is selected from at least one of bisphenol A epoxy resin, alicyclic epoxy resin and novolac epoxy resin;
the cross-linking agent is selected from at least one of diallyl phthalate, diallyl isophthalate, trimethylolpropane diallyl ester and triallyl cyanurate;
the initiator is selected from benzoyl peroxide and/or dicumyl peroxide;
the curing agent is selected from tung oil anhydride and/or phenyl imidazole;
the promoter is selected from cobalt naphthenate and/or aluminum acetylacetonate.
The raw materials are uniformly mixed to obtain the environment-friendly vacuum pressure impregnating resin with high bonding strength, and an impregnating process is selected according to specific requirements.
Preferred curing conditions are: firstly, curing for 4-6 hours at 140-150 ℃, and then curing for 7-8 hours at 170-180 ℃ to form a film.
Compared with the prior art, the invention has the following advantages:
(1) according to the modified unsaturated polyester synthesized by the method, multiple polybasic acids, polyhydric alcohols and imidized dibasic acids with good heat resistance are selected as raw materials to form an unsaturated polyester main chain with excellent heat resistance, and meanwhile, a benzene ring or alicyclic structure is introduced to enhance the mechanical strength of the unsaturated polyester main chain, so that the normal state and thermal state mechanical properties of the unsaturated polyester are enhanced on the whole; the unsaturated polyester is continuously modified by the epoxy resin, so that the shrinkage rate and viscosity of the unsaturated polyester can be reduced, the consumption of the cross-linking agent is reduced, and the content of volatile organic compounds in the resin is obviously reduced;
(2) the vacuum pressure impregnating resin prepared by using the modified unsaturated polyester synthesized in the invention as the base material has the advantages of high bonding strength, low dielectric loss, low volatile matter and stable composition, and is suitable for VPI impregnating insulation treatment of various motor electrical appliances.
Detailed Description
The following examples are further illustrative of the present invention, but do not limit the scope of the present invention.
Example 1:
(1) firstly, referring to the literature, research on preparation and modification of unsaturated polyester imide, the structural formula of imine dibasic acid is shown in the following formula (I) by taking trimellitic anhydride and 4,4' -diaminodiphenylmethane as raw materials. Then, according to a certain weight ratio, mixing the mixture in a molar ratio of 1: 1: 1: 1, respectively weighing and feeding m-phthalic acid, maleic anhydride, 1, 2-propylene glycol and neopentyl glycol, then feeding imine dibasic acid accounting for 3% of the total amount of polybasic acid and polyhydric alcohol, reacting at the temperature of 180-200 ℃, and separating out water. Stopping the reaction when the acid value is between 30 and 40mg KOH/g, and adding 0.01 percent of hydroquinone. Cooling to room temperature to obtain imine modified unsaturated polyester;
(2) according to the weight ratio of 1: mixing 0.5 of imine modified unsaturated polyester and E-44 bisphenol A epoxy resin, reacting at 100-140 ℃, and cooling to room temperature when the acid value is 10-20 mg KOH/g;
(3) uniformly mixing 50g of unsaturated polyester modified by the prepared imine and epoxy resin, 30g of E-44 bisphenol A epoxy resin, 12g of diallyl phthalate, 1.5g of dicumyl peroxide, 4.5g of tung oil anhydride and 2g of cobalt naphthenate to obtain VPI (vacuum pressure impregnation) resin;
when the resin is used, the resin is firstly cured for 4-6 hours at 140-150 ℃, and then cured for 7-8 hours at 170-180 ℃ to form a film.
Comparative example 1:
directly adopting imine modified unsaturated polyester prepared in the step (1) in the embodiment 1 as a base material, uniformly mixing 50g of imine modified unsaturated polyester, 30g of E-44 bisphenol A epoxy resin, 12g of diallyl phthalate, 1.5g of dicumyl peroxide, 4.5g of tung oil anhydride and 2g of cobalt naphthenate to prepare impregnating resin, and carrying out performance test.
Comparative example 2:
(1) directly mixing the raw materials in a molar ratio of 1: 1: 1: 1, m-phthalic acid, maleic anhydride, 1, 2-propylene glycol and neopentyl glycol are used as raw materials to synthesize unsaturated polyester, imine diacid is not added, the reaction temperature is 180-200 ℃, and water is separated out. Stopping the reaction when the acid value is between 30 and 40mg KOH/g, and adding 0.01 percent of hydroquinone. Cooling to room temperature to obtain unsaturated polyester;
(2) according to the weight ratio of 1: mixing 0.5 of unsaturated polyester and E-44 bisphenol A epoxy resin, reacting at 100-140 ℃, and cooling to room temperature until the acid value is 10-20 mg KOH/g;
(3) 50g of the prepared epoxy resin modified unsaturated polyester, 30g of E-44 bisphenol A epoxy resin, 12g of diallyl phthalate, 1.5g of dicumyl peroxide, 4.5g of tung oil anhydride and 2g of cobalt naphthenate are uniformly mixed to prepare impregnating resin, and performance test is carried out.
Example 2:
(1) firstly, referring to the literature, "research on preparation and modification of unsaturated polyester imide", an imine dibasic acid is synthesized by using trimellitic anhydride and 1, 6-hexamethylene diamine as raw materials, and the structural formula is shown as the following formula (II). Then, according to a certain weight ratio, mixing the mixture in a molar ratio of 1: 1: 1: 1, respectively weighing and feeding m-phthalic acid, maleic anhydride, 1, 2-propylene glycol and neopentyl glycol, then feeding imine dibasic acid accounting for 3% of the total amount of polybasic acid and polyhydric alcohol, reacting at the temperature of 180-200 ℃, and separating out water. Stopping the reaction when the acid value is between 30 and 40mg KOH/g, and adding 0.01 percent of hydroquinone. Cooling to room temperature to obtain imine modified unsaturated polyester;
(2) according to the weight ratio of 1: mixing 0.5 of imine modified unsaturated polyester and E-44 bisphenol A epoxy resin, reacting at 100-140 ℃, and cooling to room temperature when the acid value is 10-20 mg KOH/g;
(3) uniformly mixing 50g of unsaturated polyester modified by the prepared imine and epoxy resin, 30g of E-44 bisphenol A epoxy resin, 12g of diallyl phthalate, 1.5g of dicumyl peroxide, 4.5g of tung oil anhydride and 2g of cobalt naphthenate to obtain VPI (vacuum pressure impregnation) resin;
when the resin is used, the resin is firstly cured for 4-6 hours at 140-150 ℃, and then cured for 7-8 hours at 170-180 ℃ to form a film.
Example 3:
(1) firstly, referring to the literature, "research on preparation and modification of unsaturated polyester imide", trimellitic anhydride and 4,4' -diaminodiphenyl ether are used as raw materials to synthesize the imide diacid, and the structural formula is shown as the following formula (III). Then, according to a certain weight ratio, mixing the mixture in a molar ratio of 1: 1: 1: 1, respectively weighing and feeding m-phthalic acid, maleic anhydride, 1, 2-propylene glycol and neopentyl glycol, then feeding imine dibasic acid accounting for 3% of the total amount of polybasic acid and polyhydric alcohol, reacting at the temperature of 180-200 ℃, and separating out water. Stopping the reaction when the acid value is between 30 and 40mg KOH/g, and adding 0.01 percent of hydroquinone. Cooling to room temperature to obtain imine modified unsaturated polyester;
(2) according to the weight ratio of 1: mixing 0.5 of imine modified unsaturated polyester and E-44 bisphenol A epoxy resin, reacting at 100-140 ℃, and cooling to room temperature when the acid value is 10-20 mg KOH/g;
(3) uniformly mixing 50g of unsaturated polyester modified by the prepared imine and epoxy resin, 30g of E-44 bisphenol A epoxy resin, 12g of diallyl phthalate, 1.5g of dicumyl peroxide, 4.5g of tung oil anhydride and 2g of cobalt naphthenate to obtain VPI (vacuum pressure impregnation) resin;
when the resin is used, the resin is firstly cured for 4-6 hours at 140-150 ℃, and then cured for 7-8 hours at 170-180 ℃ to form a film.
Example 4:
(1) firstly, referring to the literature, "research on preparation and modification of unsaturated polyester imide", an imine dibasic acid is synthesized by using trimellitic anhydride and 1, 6-hexamethylene diamine as raw materials, and the structural formula is shown as the following formula (II). Then, according to a certain weight ratio, mixing the mixture in a molar ratio of 1: 1.1: 0.5: 1.1: 1, respectively weighing and feeding methyl nadic anhydride, maleic anhydride, 1, 2-propylene glycol and neopentyl glycol, then feeding imine dibasic acid accounting for 3% of the total amount of polybasic acid and polyhydric alcohol, reacting at the temperature of 180-200 ℃, and separating out water. Stopping the reaction when the acid value is between 30 and 40mgKOH/g, and adding 0.02 percent of hydroquinone. Cooling to room temperature to obtain imine modified unsaturated polyester;
(2) according to the weight ratio of 1: mixing 0.7 of imine modified unsaturated polyester and 6701# alicyclic epoxy resin, reacting at 100-140 ℃, and cooling to room temperature until the acid value is 10-20 mg KOH/g;
(3) uniformly mixing 55g of unsaturated polyester modified by the prepared imine and epoxy resin, 25g of E-44 bisphenol A epoxy resin, 12g of triallyl cyanurate, 1.5g of dicumyl peroxide, 4.5g of tung oil anhydride and 2g of cobalt naphthenate to obtain VPI impregnating resin;
when the resin is used, the resin is firstly cured for 4-6 hours at 140-150 ℃, and then cured for 7-8 hours at 170-180 ℃ to form a film.
Example 5:
(1) firstly, referring to the literature, "research on preparation and modification of unsaturated polyester imide", trimellitic anhydride and 4,4' -diaminodiphenyl ether are used as raw materials to synthesize the imide diacid, and the structural formula is shown as the following formula (III). Then, according to a certain weight ratio, mixing the mixture in a molar ratio of 1: 1: 1: 1.3: 1, weighing and feeding methyl tetrahydrophthalic anhydride, maleic anhydride, 1, 2-propylene glycol, neopentyl glycol and 1, 4-cyclohexanedimethanol respectively, then feeding imine dibasic acid accounting for 3% of the total amount of polybasic acid and polyhydric alcohol, reacting at the temperature of 180-200 ℃, and separating out water. Stopping the reaction when the acid value is between 30 and 40mg KOH/g, and adding 0.02 percent of hydroquinone. Cooling to room temperature to obtain imine modified unsaturated polyester;
(2) according to the weight ratio of 1: mixing 0.3 of imine modified unsaturated polyester and E-51 bisphenol A epoxy resin, reacting at 100-140 ℃, and cooling to room temperature when the acid value is 10-20 mg KOH/g;
(3) uniformly mixing 40g of unsaturated polyester modified by the prepared imine and epoxy resin together, 30g of 638s novolac epoxy resin, 22g of diallyl isophthalate, 1.5g of dicumyl peroxide, 4.5g of tung oil anhydride and 2g of cobalt naphthenate to prepare VPI impregnating resin;
when the resin is used, the resin is firstly cured for 4-6 hours at 140-150 ℃, and then cured for 7-8 hours at 170-180 ℃ to form a film.
To further prove the beneficial effects of the environment-friendly VPI impregnating resin, the bonding strength, the cured volatile content and the electrical properties of the products prepared in the examples 1-5 and the comparative examples 1-2 are tested according to the corresponding national standards, and the results are shown in the table 1.
TABLE 1
As can be seen from Table 1, the environment-friendly VPI impregnating resin prepared by the invention has the advantages of high bonding strength, low volatilization, low dielectric loss and good composition stability, and is suitable for VPI impregnating insulation treatment of various motor electrical appliances.
Claims (6)
1. The environment-friendly vacuum pressure impregnating resin with high bonding strength is characterized by comprising the following raw materials in percentage by mass:
45-55% of modified unsaturated polyester;
20-35% of epoxy resin;
10-25% of a cross-linking agent;
0.5-2.0% of an initiator;
3.0-5.0% of a curing agent;
0.1-2.0% of an accelerator;
the modified unsaturated polyester is unsaturated polyester modified by imine and epoxy resin, and the preparation method comprises the following steps:
the method comprises the following steps: imine dicarboxylic acid, at least one polybasic acid and at least one polyhydric alcohol are used as raw materials, and imine modified unsaturated polyester is prepared through polycondensation reaction; the acid value of the imine modified unsaturated polyester is 30-40 mgKOH/g; the imidized diacid is prepared by taking trimellitic anhydride and diamine as raw materials, wherein the diamine is selected from at least one of 4,4 '-diaminodiphenylmethane, 4' -diaminodiphenyl ether and 1, 6-hexamethylene diamine;
the mass of the imidization dibasic acid is 1-3% of the total mass of the polybasic acid and the polyhydric alcohol;
step two: mixing the imine modified unsaturated polyester prepared in the step one with epoxy resin, and carrying out copolymerization reaction to prepare unsaturated polyester modified by both imine and epoxy resin; the acid value of the unsaturated polyester modified by the imine and the epoxy resin together is 10-20 mgKOH/g;
the mass ratio of the epoxy resin to the imine modified unsaturated polyester is 0.1-1: 1.
2. the environment-friendly vacuum pressure impregnation resin with high bond strength as claimed in claim 1, wherein the diamine is selected from 4,4' -diaminodiphenylmethane.
3. The environment-friendly vacuum pressure impregnation resin with high bonding strength as claimed in claim 1, wherein in the first step:
the polybasic acid is selected from at least one of isophthalic acid, methyl nadic anhydride, maleic anhydride and methyl tetrahydrophthalic anhydride;
the polyol is selected from at least one of 1, 2-propylene glycol, neopentyl glycol and 1, 4-cyclohexanedimethanol;
the molar ratio of the polybasic acid to the polyhydric alcohol is 1: 1 to 1.3.
4. The environment-friendly vacuum pressure impregnation resin with high bonding strength as claimed in claim 1, wherein in the second step:
the epoxy resin is at least one selected from bisphenol A epoxy resin, alicyclic epoxy resin and hydrogenated bisphenol A epoxy resin.
5. The environment-friendly vacuum pressure impregnation resin with high bonding strength as claimed in claim 1, wherein the epoxy resin in the raw material composition is at least one selected from bisphenol a type epoxy resin, alicyclic epoxy resin and novolac epoxy resin;
the crosslinking agent is selected from at least one of diallyl phthalate, diallyl isophthalate, trimethylolpropane diallyl ester and triallyl cyanurate.
6. The high bond strength eco-friendly vacuum pressure impregnation resin of claim 1, wherein the initiator is selected from benzoyl peroxide and/or dicumyl peroxide;
the curing agent is selected from tung oil anhydride and/or phenyl imidazole;
the promoter is selected from cobalt naphthenate and/or aluminum acetylacetonate.
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| CN109369877A (en) * | 2018-09-30 | 2019-02-22 | 台州禾欣高分子新材料有限公司 | A kind of preparation method of high breaking strength polyurethane resin |
| CN112029281B (en) * | 2020-09-02 | 2023-08-01 | 苏州巨峰电气绝缘系统股份有限公司 | Corona-resistant polyester-imide impregnating resin and preparation method thereof |
| CN115340818A (en) * | 2021-05-14 | 2022-11-15 | 丹阳市沃德立电工材料有限公司 | High-performance high-temperature-resistant impregnating resin and preparation method thereof |
| CN115626978B (en) * | 2022-10-19 | 2024-03-01 | 擎天材料科技有限公司 | Polyester resin for powder coating and preparation method and application thereof |
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| CN106811023A (en) * | 2016-12-06 | 2017-06-09 | 嘉兴市新大陆机电有限公司 | A kind of environment-friendly type wind-driven generator VPI impregnating resins and preparation method thereof |
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| EP0383976A1 (en) * | 1987-12-31 | 1990-08-29 | General Electric Company | Polyetherimide ester elastomer |
| CN101514276A (en) * | 2008-12-30 | 2009-08-26 | 上海新天和树脂有限公司 | Method for preparing solventless unsaturated polyester-imide wire coating enamel |
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| CN102993917A (en) * | 2012-11-22 | 2013-03-27 | 艾伦塔斯电气绝缘材料(珠海)有限公司 | Impregnating insulating paint for medium-high-voltage motor, and preparation method thereof |
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